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Brent Gardner 2021-10-22 11:20:45 -04:00
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README.md
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# PiShrink #
PiShrink is a bash script that automatically shrink a pi image that will then resize to the max size of the SD card on boot. This will make putting the image back onto the SD card faster and the shrunk images will compress better.
In addition the shrinked image can be compressed with gzip and xz to create an even smaller image. Parallel compression of the image
In addition the shrunk image can be compressed with gzip and xz to create an even smaller image. Parallel compression of the image
using multiple cores is supported.
## Usage ##
```
Usage: $0 [-adhrspvzZ] imagefile.img [newimagefile.img]
@ -20,7 +22,9 @@ Usage: $0 [-adhrspvzZ] imagefile.img [newimagefile.img]
If you specify the `newimagefile.img` parameter, the script will make a copy of `imagefile.img` and work off that. You will need enough space to make a full copy of the image to use that option.
* `-r` will attempt to repair the filesystem if regular repairs fail
* `-s` prevents automatic filesystem expansion on the images next boot
* `-v` enables more verbose output
* `-r` will attempt to repair the filesystem using additional options if the normal repair fails
* `-z` will compress the image after shrinking using gzip. `.gz` extension will be added to the filename.
* `-Z` will compress the image after shrinking using xz. `.xz` extension will be added to the filename.
* `-a` will use option -f9 for pigz and option -T0 for xz and compress in parallel.
@ -29,11 +33,16 @@ If you specify the `newimagefile.img` parameter, the script will make a copy of
Default options for compressors can be overwritten by defining PISHRINK_GZIP or PSHRINK_XZ environment variables for gzip and xz.
## Prerequisites ##
If you are trying to shrink a [NOOBS](https://github.com/raspberrypi/noobs) image it will likely fail. This is due to [NOOBS partitioning](https://github.com/raspberrypi/noobs/wiki/NOOBS-partitioning-explained) being significantly different than Raspbian's. Hopefully PiShrink will be able to support NOOBS in the near future.
If you are running PiShrink in VirtualBox you will likely encounter an error if you
attempt to use VirtualBox's "Shared Folder" feature. You can copy the image you wish to
shrink on to the VM from a Shared Folder, but shrinking directctly from the Shared Folder
is know to cause issues.
If using Ubuntu, you will likely see an error about `e2fsck` being out of date and `metadata_csum`. The simplest fix for this is to use Ubuntu 16.10 and up, as it will save you a lot of hassle in the long run.
## Installation ##
```bash
wget https://raw.githubusercontent.com/Drewsif/PiShrink/master/pishrink.sh
chmod +x pishrink.sh
@ -41,6 +50,7 @@ sudo mv pishrink.sh /usr/local/bin
```
## Example ##
```bash
[user@localhost PiShrink]$ sudo pishrink.sh pi.img
e2fsck 1.42.9 (28-Dec-2013)
@ -65,6 +75,7 @@ Shrunk pi.img from 30G to 3.1G
```
## Contributing ##
If you find a bug please create an issue for it. If you would like a new feature added, you can create an issue for it but I can't promise that I will get to it.
Pull requests for new features and bug fixes are more than welcome!